>I have a client that has developed an application for their business in .Net/SQL. They would like to run my application from within their application (VFP/VFP). Ideally, they would like for this to appear as a just another module of their application, as opposed to a seperate stand-alone application.
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>Can this be done?

In a word no...

And the real question is why the heck would you want to? Either you have a compelling reason to use .NET or you don't...